plandex models add doesn't offer openrouter when it should

[cschneid]

Minor UX issue:

Showing available models shows a handful of openrouter models, but add doesn't offer Openrouter as a default option.

I have both OPENAI_API_KEY and OPENROUTER_API_KEY set, and not a together key.

$ plandex models available

🏠 Built-in Models
+------------+---------------------------------------+------------+--------------------+
|  PROVIDER  |                 NAME                  |     🪙     |         🔑         |
+------------+---------------------------------------+------------+--------------------+
| openai     | gpt-4-turbo                           |     128000 | OPENAI_API_KEY     |
| openai     | gpt-4-turbo-2024-04-09                |     128000 | OPENAI_API_KEY     |
| openai     | gpt-4-turbo-preview                   |     128000 | OPENAI_API_KEY     |
| openai     | gpt-4-0125-preview                    |     128000 | OPENAI_API_KEY     |
| openai     | gpt-4-1106-preview                    |     128000 | OPENAI_API_KEY     |
| openai     | gpt-4                                 |       8000 | OPENAI_API_KEY     |
| openai     | gpt-3.5-turbo                         |      16385 | OPENAI_API_KEY     |
| openai     | gpt-3.5-turbo-0125                    |      16385 | OPENAI_API_KEY     |
| openai     | gpt-3.5-turbo-1106                    |      16385 | OPENAI_API_KEY     |
| openrouter | anthropic/claude-3-opus               |     200000 | OPENROUTER_API_KEY |
| openrouter | anthropic/claude-3-opus               |     200000 | OPENROUTER_API_KEY |
| openrouter | anthropic/claude-3-sonnet             |     200000 | OPENROUTER_API_KEY |
| openrouter | anthropic/claude-3-haiku              |     200000 | OPENROUTER_API_KEY |
| together   | mistralai/Mixtral-8x22B-Instruct-v0.1 |      65536 | TOGETHER_API_KEY   |
| together   | mistralai/Mixtral-8x7B-Instruct-v0.1  |      32768 | TOGETHER_API_KEY   |
| openrouter | google/gemini-pro-1.5                 | 2800000000 | OPENROUTER_API_KEY |
+------------+---------------------------------------+------------+--------------------+


 plandex models available --custom  👉 show available custom models only
 plandex models  👉 show current plan model settings
 plandex set-model  👉 update current plan model settings
 plandex models delete  👉 delete a custom model

$ plandex models add
? Select provider:
> openai
  together
  custom